Amazon EC2-vtigercrm-M$ Outlook vtiger add-on problem

We're striking out all over. Maybe someone here can help us. The vtiger add-on for MS Office Outlook won't work with our EC2 instance. We keep getting the error "vtiger server not found, please check the vtiger url" even though we're using exactly the same (elastic IP) URL that works fine otherwise (from web browsers and via ssh).

Just installed vtiger crm on our own server (CLearOS/CentOS) in its own subdomain and the Outlook plugin also failed to find it--if we try to access http://vtigercrm.... is tells us 'server not found.' If we try to access https://vtigercrm..., then after quite a bit of cranking and grinding it gives 'unknown error occurred.'

It doesn't seem to be a firewall issue. We set the Security Group for the EC2 site to allow any port from any IP address and the Outlook connection still failed.

Follow-up: It seems to be somehow connected with our local office setup. When we try to access the vtiger using the Outlook add-on from a Windows box outside the office, or even via a box connected directly to a public IP address on the modem, the connection works fine. ClearOS is functioning as our gateway and router and local DNS server.

Also, interestingly, the problem also arises if we use the IP address of the vtiger rather than a URL: http://n.n.n.n/vtiger.

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